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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f617b0158366b2e838fbc399266070ea4c64e7fd62ce45d59759ba7ce27c8be' 
  AND token = 'eFLO46Q8OVbXLtfZSez1RdxtSWlwO910UMhF5I5he/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}